Topic: Solubility of Solid and Gases in Liquids Mock Test, Test No.: 01, Total MCQs: 10
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We hope the given Chemistry MCQs for Class 12 with Answers Chapter 2 Solutions will help you. If you have any query regarding CBSE Class 12 Chemistry Solutions MCQs Pdf, drop a comment below and we will get back to you at the earliest.
 Value of Henry’s constant KH.? (a) increases with increase in temperature (b) decreases with increase in temperature (c) remains constant (d) first increases then decreases
Answer: (a) increases with increase in temperature
Henry’s law is a gas law which states that at the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant. According to Henry’s law, solubility of a gas in a liquid is directly proportional to the pressure of the gas.
P α X
In order to change the proportionality constant we change this into KH.
P = KHX
P= Partial pressure of gas
X= solubility of gas in liquid
KH = Henry’s constant
KH depends only on nature of gas, nature of liquid and temperature (T). As temperature increases, ‘KH ‘ increases and X decreases.
- Question 1 of 6
Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane is nenzene at 298 K under 760 mm Hg is
(a) 1.78 × 10-3
- Question 2 of 6
At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is
(a) less than the rate of crystallisation
(b) greater than the rate of crystallisation
(c) equal to the rate of crystallisation
- Question 3 of 6
Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon .
(b) nature of solute
(d) nature of solvent
- Question 4 of 6
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to
(a) low temperature
(b) low atmospheric pressure
(c) high atmospheric pressure
(d) both low temperature and high atmospheric pressure
- Question 5 of 6
Which of the following statements is false?
(a) Units of atmospheric pressure and osmotic pressure are the same.
(b) In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.
(c) The value of molal depression constant depends on nature of solvent.
(d) Relative lowering of vapour pressure is a dimensionless quantity.
- Question 6 of 6
The value of Henry’s constant KH is
(a) greater for gases with higher solubility.
(b) greater for gases with lower solubility.
(c) constant for all gases.
(d) not related to the solubility of gases.
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